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Finding the Fourth Proportional to 665,937.60, 998,979.30 and 644,942.40

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Solution

The fourth proportional to 665,937.60, 998,979.30 and 644,942.40 is: 967,484.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,937.60 : 998,979.30 = 644,942.40 : x
  2. Step 2: Convert to fraction form
    665,937.60/998,979.30 = 644,942.40/x
  3. Step 3: Cross multiply
    665,937.60x = 998,979.30 × 644,942.40
  4. Step 4: Simplify right side
    665,937.60x = 644,284,107,292.32
  5. Step 5: Solve for x
    x = 644,284,107,292.32/665,937.60
  6. Step 6: Final answer
    x = 967,484.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.